Young Brunette Girl Travelling Around The World With Sunflowers

Traditionally, several Native American groups planted sunflowers on the north edges their gardens as a "fourth sister" to the better known three sisters combination corn, beans, and squash. Annual species are ten planted for their allelopathic properties.
However, for commercial farmers growing commodity crops, the sunflower, like any other unwanted plant, is ten considered a weed. Especially in the midwestern US, wild (perennial) species are ten found in corn and soybean fields and can have a negative impact on yields.
Sunflowers can be used to extract toxic ingredients from soil, such as lead, arsenic and uranium. They were used to remove cesium-137 and strontium-90 from a nearby pond after the Chernobyl disaster.